Automatic-exhaust-valve construction



Aug. 21, R923.

' D. J. CAMPBELL AUTOMATIC sxmwscr VALVE CONSTRUCTION Filed Feb. 28

Dow ALD J. QPMPBELL BY fifl ffiam,%

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Patented Aug. 21, 1923. I i r i nears snares earner DONALD J. CAMPBELL, onirausrznson HEIGHTS, MICHIGAN.

AUToreA'rIo-EXHAUs'r-VALVE CONSTRUCTION.

Application filed February 28, 1921. Serial ar 448,720.

TooZZ whom it may concern: 7 further object of the invention is to make Be it known that I, DONALD J. CAMPBELL, this valve of very simple character, of few a citizen of the United states of America, parts, and so that it will always be effective residing at Muskegon Heights, in the county and substantially certain to stay in order in ft or" Muskegon and State of Michigan, have spite of the severe conditions under which invented certain new and useful Improveit is used.

merits in Autornatic Exhaust-Valve (1011- Many other objects and purposes than structions; and I do herebydeclare the fol-- those stated will also appear as understand lowing to be a full, clear, and exact descriping of the invention is had from the follow- 1o tion f the invention, such as will enable ling description, taken in connection with others skilled in the art to which it apperthe accompanying drawing, in which,

tains to make and use the same. F 1 is a central vertical section through This invention relates to an automaticair theupper part of the sand hopper and 55- release valve for use in connection with comperating valve casing, my invention of 2111- 1E pressed air mouldforming machines, one tomatic exhaust valve being applied theretype of which is shown and described in a O- copending application for patent filed by me F 1g- 2 1s a fragmentary vertical section h i S i l Number 443,739, filed" Feb show ng the )arts of the valve in another 10, 1921, and in which sand is forced by P sition than that occupied in Fig. l. 7 29 the impulse of compressed air from a hopig- 3 is a Side elevation of the expanding Per i tth ld OB ld 1 3 as t {111 perforated sleeve which forms one element the mould and compress the sand to the re- I he Xh ust valve construction.

quired density. in doing this, the sand congi 1 Ver ical transverse section on taming hopper is clamped between an upper the plane or line 4&4, of I 1, and 8 25 valve casing through which the air is carg- 5 1s a similar section on the plane ried to the upper end of the hopper and at f line 5 5, of Fig. 1.

mould box located below the hopper so as Llke reference characters refer to like to preclude the escape and waste of the air, parts in the different figures of the drawing.

slight vents being provided, however, that The sand hopper with which my invention 35 when the air has done its work'of compressis used is shown at the upper part thereof,

i th a d i t th ld b x and the at 1, being provided with an out-turned ansupply above is cut off, the pressure in the nular flange at its upper end. A valve cashopper will slowly decrease. This in time mg 3 is located over the hopper in the operwould free the hopper and the mould box ative position of the parts, and intermediate for further operations therewith, but in orits upper and lower ends, is formed with a der to save time, it is desirable that this extransverse horizontal web 4 in which an hausting of the air pressure shall be more opening made for air passage, this openrapid. At the same time, the exhaust of ing at its upper side being fashioned as a the pressure must not interfere with the valve seat. The under side of the valve casworkings of the pressure of the air during ing is covered by a plate 6 inset into the the time that the mould is being made. flange 5 made around the lower end of the It is a primaryobject and purpose of the valve casing, and secured thereto by screws present invention to provide the machine 7. A rubber ring gasket 8 is retained'bewith an automatic exhaust valve which tween the edges of the plate and the outer 4a i inoperative for that purpose during depending portions of the flange 5 as shown.

th ti th t th o ld is b i f rm d, A number of openings 9 are made in the but which becomes automatically operplate 6 in which short tubes 9 are secured,

ti' as soon as th o ki r s re the same being directed at the proper angle i ut ff and m ape of the ai nd to aline with the sand passages in the hopper reduction of the pressure has taken place {13 appear in the copending application for in the hopper, thereupon bringing the patent thereon. exhaust valve openings .into play to allow' A valve 10 is normally seated in the openthe rapid reduction of the pressure and ing made through the web 4L, having a rod 11 freeing of the parts ofithe machineforthe attached thereto which extends upward no necessary movements thereof and without through a second transverse web 12 and a lossof time as would otherwise occur. A stuffing box 13 above the same, this web being cast integral with a substantially cylindrical sleev 1 1 which is attached at its upper end to a suitable overhead beam 15, forming a part of the moulding machine, and at its lower end is provided with an outturned annular'flange 16, matching and connecting with a similar flange 17 at the upper end oi the valve casing 3. Compressed air is led into the chamber made by the Webs t and 12 and the sides of the valve casing 3 and sleeve 1 1 between said webs by an inlet pipe 13. Rod 11 at its upper end has attachment to a block 19 which is pivotally connected at 20 with the inner end of a lever 21 which extends through a slot in a side of the sleeve and is pivotally mounted between its ends at 22 on lugs 23 cast integral with and extending outwardly from the sleeve. A coiled spring 23 is disposed between the beam 15 and theupper side of the inner end of lever 21, tei'iding to hold the valve 10 in closing position.

The valve casing one side below the web 1' has acylindrical projection 24, somewhat enlarged at its outer portion as indicated at 2 1;" and interiorly bored for the reception of the moving parts of the valve mechanism of my invention. A passage 25 connects the interior of the lower portion of the valve casing-3 with the larger opening bored in projection A series of openings 26 are made in the walls of the part 24., spaceu apart around the same as shown.

/Vithin projection i l a plug 2'[ is located, the same having a slightly enlarged head 27. to fit the larger outer boring in the larger outer section 24? and acting to limit the movement of the plug inward. A sleeve of metal 28 is attached to and extends inwardly from the plug, this sleeve being divided at one side, as indicated at 29, whereby the same may expand, as will later appear. A series of spaced apart openings 30 are made inthe sides oi sl eve 28 and are adaptedto aline with the openings 26 when the plug 27 is at its inner position as shown in Fig. 1.

1111 exterierly threaded plug 31 is threaded. into the end of the enlarged portion 24 of said projection 2 1- and is equipped at its outer side with a head 32 whereby the same may be readily turned by a wrench or like implement. A strong coiled spring 33 is interposed between the two plugs 27 and 31, the effect of which is to normally force the first plug 27 to inner position to bring openings 2G and 30 into alinement. In orderthat the plug' 27 shall not turn and thus disturb the alinement of the openings, a pin 34 iseonnected to the projection 24 at the inner shoulder between the larger and smaller borings therein and seats in a recess 35 in the edge of the part 27 of the plug. It is evident that the tension of the spring 33 may be regulated. by adjusting the second plug 31 to different positions. In practice,

I prefer to more or'less cover the openings at 26 by a surrounding spaced apart flange 36, as shown in Figs. 1 and 2, the same protecting the openings against the entrance of sand particles or dirt,-and also directing the air exhausted'outwardly in'a common direction, not permitting it' to pass outwardly in a number of directions radially as would be the case if the flange was eliminated.

In the operation of the exhaust valve mechanism, when sand is to be forced from the hopper into the mould boxer flask, the handle 21 is operated in a downward direction, lifting valve 10 and permitting passage of the air'into the lower part of the valve casing 3, below web 4 and thence through the tubes 9 into the hopper. At the same time the full pressure of the air is carried through passage 25. against the inner end of the plug 27 and into the sleeve 28, the Y pressure against the inner sides thereof ex valve 10 is momentary, only long enough for the air to force the sandfrom the hopper, after which thehandle 21 is released, valve 10 innnediatelyclosing. The relief vent, above noted, in the plate between the lower end of the hopper and the mould box into which the sand is forced, said plate being the subject matter of a separate application for patent, relieves the [JI'QSSUIB of the air in the hopper, the sand being porous and the air passing therethrough. This relief soon reduces the pressure sufficient that spring 33 moves the sleeve 28 and at tached plug back to its initial position, shown in Fig. 1, the openings 26 and 30 alining, and the air eXhaustingvery rapidly as is evident. .Accordingly, in acvery short time, almost instantly, the air pressure in the hopper is reduced to that of the atmosphere outside, and the hopper may be moved away from the valve casing 3 for the reception of'additiona-l sand.

The construction of automatic exhaust valve is very simple yet effective for the purposes forwhich it is designed. Its parts are durable and not liable to get out of, order. The spring tension maybe varied as desired for different conditions in a particularly simple and efiective manner. The appended claims define the invention and I consider myself entitled to all forms of structure coming within their scope.

I claim:

1. In a device of the character descr bed, a valve casing adapted to receive air under pressure, said casing at one side having a projecting portion interiorly bored for part of its length, the outer portion of the boring being of larger diameter than the inner portion, and said inner portion having a plurality of communicating openings through the side of the said projecting portion, a plug loosely mounted within said projecting portion and having an enlarged outer head, a split sleeve attached to the inner end of the plug having a plurality of openings through the side thereof which come into alinement with the first mentioned openings when the plug is in inner position, means for holding the plugjfrom rotary movement, a second plug threaded into the outer end of said projecting portion, and a strong compression spring disposed between the two plugs, substantially asdescribed.

2. In a device or the character described, a valve casing adapted to receive air under pressure, said casing at one side having an exhaust valve construction associated therewith, comprising a movable member having a series of openings therethrough, a surrounding member therefor having a cooperatin series of oaenin s normall alinin b C therewith, means for yieldingly holding the movable member in such position that said openings are in alineinent, and a passage leading from the interior of the valve casing to carry the compressed air against the movable member to move the same to carry the openings out of alinement, the same remain ing out of alinement while the force of the compressed air is fully exerted against the movable member but returning to original alinement on escape of and reducing ofa portion of the air pressure in the valve casing, substantially as described.

3. In a device of the character described, a valve casing adapted to receive air under pressure, said casing having an outlet passage at one side thereof, and being provided with an interiorly bored projecting portion into which said outlet passage leads, and movable valve means located within said projecting portion, said valve means and projecting portion having openings normally positioned in alinement and yieldingly held in such alinement, said valve means moving on the exertion or" air pres sure thereagainst from the valve casing to place said openings out of alinement, returning to original position 011 lowering of the pressure to predetermined point, substantially as described.

4:. In a device of the character described, a casing adapted to receive air under pressure, said casing having an outlet passage at one side and an interiorly bored projecting portion into which said passage leads, said projecting portion having openings through its sides, a plug loosely mounted within said projecting portion, a split sleeve attached to the inner end of the plug, said sleeve having a plurality of openings registering with the openings in said projecting portion when the plug is in its extreme inner position, means for stopping the plug at such position that the openings register, means for holding the plug from rotation, and strong spring means normally forcing the plug to inner position.

5. In a device of the character described, a casing adapted to receive air under pres sure, said casing having an outlet passage at one side thereof and an interiorly bored projecting portion into which said outlet passage leads, said projecting portion hav ing openings through its sides, a plug loosely mounted Within said projecting portion, an expansible sleeve attached to the inner end of the plug, said sleeve having a plurality of openings registering with the openings insaid projecting portion when the plug is in its extreme inner position, spring means normally forcing the plug to said inner position, and means for adjusting the pressure of said spring means, substantially as described.

In testimony whereof I atlix my signature.

DONALD J. CAMPBELL. [Ls] 

